Added a couple more methods to the logback assert test helper

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.45%. Comparing base (497b9f2) to head (ceee9f0). Report is 94 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6004 +/- ## ============================================ + Coverage 83.39% 83.45% +0.05% - Complexity 26927 27234 +307 ============================================ Files 1681 1697 +16 Lines 103965 105320 +1355 Branches 13189 13311 +122 ============================================ + Hits 86702 87891 +1189 - Misses 11613 11728 +115 - Partials 5650 5701 +51 ```

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